Induction Influences of Three Phase Lines on Parallel Communication Networks.

The magnitude of the induction influences of power lines on communication networks by normal operation depends largely on the presence of grounding cables, i. e. mainly their number and quality of their electrical parameters. A detailed analysis is performed and conclusions are drawn from the results derived by the study of digital computer data and control calculations. The differences between the influences of alternative arrangements of the phase conductors of a three phase double line are determined and the influence of steel or aluminium and steel core grounding cables is discussed. Their marked maxima and minima show that the arrangement of the phases on a tower of a double line has a strong influence on the magnitude of the induced voltage in a distant communication conductor which must be respected by experimental verfication of the results by normal operation. It is necessary to respect the concrete arrangement of the conductors in the considered parallel section.